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v3.20.1

Accounting policies - Weighted the fair values estimated (Details) | 12 Months Ended
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Dec. 31, 2019
Retail [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 100.00%
Bulk [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 100.00%
Manufacturing Units [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 100.00%
Discounted Cash Flow Method [Member] | Retail [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 80.00%
Discounted Cash Flow Method [Member] | Bulk [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 80.00%
Discounted Cash Flow Method [Member] | Manufacturing Units [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 80.00%
Guideline Public Company Method [Member] | Retail [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Guideline Public Company Method [Member] | Bulk [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Guideline Public Company Method [Member] | Manufacturing Units [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Mergers And Acquisitions Method [Member] | Retail [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Mergers And Acquisitions Method [Member] | Bulk [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%
Mergers And Acquisitions Method [Member] | Manufacturing Units [Member] |
Estimated Fair Value Percentage Segment Reporting Information | 10.00%

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- Definition Represents the estimated fair value of reporting segments. + References No definition available. + Details
Name: | cwco_EstimatedFairValuePercentageSegmentReportingInformation
Namespace Prefix: | cwco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_RetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cwco_BulkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cwco_ManufacturingUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cwco_FairValueDeterminingMethodAxis=cwco_DiscountedCashFlowMethodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cwco_FairValueDeterminingMethodAxis=cwco_GuidelinePublicCompanyMethodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cwco_FairValueDeterminingMethodAxis=cwco_MergersAndAcquisitionsMethodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |